Five solvent-induced cadmium coordination polymers (CPs) based on the same mixed ligands

Five new solvent-induced cadmium coordination architectures, {[Cd(bib)(5-Br-H(2)ip)] center dot EtOH}(n) (1), {[Cd-0.5(bib)(0.5)(5-Br-H(2)ip)(0.5)]center dot 3H(2)O(n) (2), {[Cd-2(bib)(5-Br-H(2)ip)(2)(MeOH)]}(n) (3), {[Cd(bib)(0.5)(5-Br-H(2)ip) (H2O)(2)]center dot H2O}(n) (4), and {[Cd(bib)(0.5)(5-Br-H(2)ip)(H2O)]}(n) (5), have been constructed from the same materials (1,4-bis(2-methyl-imidazol-1-yl) butane (bib), 5-bromoisophthalic acid (5-Br-H(2)ip) and Cd(Ac)(2)center dot 2H(2)O) under different reaction solvents. As controlled by solvent systems, compound 1 shows a 3-fold interpenetrating 3D framework based on the left- and right-handed helical chains, while compound 2 reveals a 3-fold interpenetrating 3D network and each single net is based on the left- handed, right-handed and meso-helical chains. Compound 3 is a 3D framework that can be simplified as a 6-connected net with (4(8).6(2)) topology. Both 4 and 5 display 3D supramolecular frameworks through weak aromatic pi-pi stacking interactions and hydrogen bonding interactions. However, the topologies of 4 and 5 are definitely different. Compound 4 presents a 3-connected net with (8(2).10) topology, while compound 5 reveals a 4-connected net with (4(2).6(3).8) topology. The effects of solvents on the crystal structures were discussed and thermogravimetric analysis and solid- tate photoluminescence results for 1-5 were investigated.